jot2re / gmp-java

JNI wrapper to the GMP library

GMP-Java is a general-purpose JNI wrapper to the GMP library. It's heavily based on the wrapper written in GNU Classpath for Big Integers (GNU Classpath uses GMP for BigInteger objects). This wrapper does nothing more than make it easier to use GMP big integers from Java.

The original copyright notices have been left intact. It should be noted that this particular work is copyright (C) 2009 didier deshommes [email protected] and released under the GPL 2 or later.

Building

Make sure JAVA_HOME is set in your environment.

You'll need a recent JVM, the GMP library and its sources to build this module. To build it, simply type make. When the sources finish building, you should have a jar file called GMP.jar that you can use in your Java application now.

Using

You'll need to add GMP.jar to you classpath. You will also need to add the generated lib directory to your java.library.path. Example:

 $ javac -cp target/*.jar Program.java
 $ java  -Djava.library.path=gmp-java/ -cp gmp-java/ Program

The main exposed class is org.dfdeshom.math.GMP. This library follows the same conventions as GMP for usage for efficiency reasons. In particular, all methods return void and GMP objects are modified IN-PLACE. In general, inputs go first in methods. Example:

abs(GMP input, GMP result)

An example of using this library in java can be found in example.java which can be run using make example